2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)最新文献
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880419
H. Leligou, J. Sifnaios, G. Pikrammenos
Tree-shaped topologies present attractive cost advantages for broadband access networks by allowing many customers to share the expensive head-end equipment and the feeder section and provide a graceful upgrade path towards the photoionization of the local loop. In addition they offer reuse of the copper last drops to the customer at least during the crucial introductory phase and probably for many years to come. Typical examples are hybrid fiber coaxial (HFC) and passive optical network (PON) systems. The TDMA multiplexing of traffic entering such a system is governed by the MAC protocol, which arbitrates the allocation of bandwidth to the shared feeder. At the same time the need to integrate telecom services presenting different quality requirements with plain best effort services over the same infrastructure brings new issues to the design of such an access mechanism. The MAC protocol as the only arbiter of the upstream bandwidth directly affects the QoS provided to each upstream traffic flow and must meet several constraints. Such constraints include the adequate speed of operation exploiting in the highest degree the speed of H/W implementation, flexibility to support efficiently the largest number of services and applications offering an adequate number of QoS classes and independence of higher layers, protocols and future extensions to traffic management specifications. The implementation of a MAC protocol targeting these goals in the framework of the AROMA research system is presented in this paper. We discuss the details and the implementation cost of the solutions followed and we evaluate the implemented mechanisms using computer simulation.
{"title":"Hardware implementation of multimedia driven HFC MAC protocol","authors":"H. Leligou, J. Sifnaios, G. Pikrammenos","doi":"10.1109/MELCON.2000.880419","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880419","url":null,"abstract":"Tree-shaped topologies present attractive cost advantages for broadband access networks by allowing many customers to share the expensive head-end equipment and the feeder section and provide a graceful upgrade path towards the photoionization of the local loop. In addition they offer reuse of the copper last drops to the customer at least during the crucial introductory phase and probably for many years to come. Typical examples are hybrid fiber coaxial (HFC) and passive optical network (PON) systems. The TDMA multiplexing of traffic entering such a system is governed by the MAC protocol, which arbitrates the allocation of bandwidth to the shared feeder. At the same time the need to integrate telecom services presenting different quality requirements with plain best effort services over the same infrastructure brings new issues to the design of such an access mechanism. The MAC protocol as the only arbiter of the upstream bandwidth directly affects the QoS provided to each upstream traffic flow and must meet several constraints. Such constraints include the adequate speed of operation exploiting in the highest degree the speed of H/W implementation, flexibility to support efficiently the largest number of services and applications offering an adequate number of QoS classes and independence of higher layers, protocols and future extensions to traffic management specifications. The implementation of a MAC protocol targeting these goals in the framework of the AROMA research system is presented in this paper. We discuss the details and the implementation cost of the solutions followed and we evaluate the implemented mechanisms using computer simulation.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125790380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.879697
L. Gołębiowski, D. Mazur
Parasitic torque harmonics and stator current harmonics to rotational speed of the asynchronous motor are presented in this paper. To calculate these relationships a 2.5D finite element model has been used. The rotor bar skew has been simulated with the division of the electric machine into so called elementary machines having straight, but shifted against each other, rotor bars. The obtained results on both 2D and 3D graphs are presented to the rotational speed of the electric motor. Parameters for each particular harmonics have been found with these graphs. These graphs help to identify the origins of these harmonics as the co-action of the MMF of the stator current and the magnetic induction from the rotor in the airgap. Particular attention has been payed to how iron saturation influences these harmonics. The harmonics under study (in quantity of 18) has been taken under consideration, because they exhibited their presence in the above mentioned graphs as the functions of speed. Their origin has been also indicated on the graphs made as an extension of the Kluszczynski analytic/graphic diagrams.
{"title":"The effect of strong parasitic synchronous and asynchronous torques in induction machine with rotor eccentricity","authors":"L. Gołębiowski, D. Mazur","doi":"10.1109/MELCON.2000.879697","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879697","url":null,"abstract":"Parasitic torque harmonics and stator current harmonics to rotational speed of the asynchronous motor are presented in this paper. To calculate these relationships a 2.5D finite element model has been used. The rotor bar skew has been simulated with the division of the electric machine into so called elementary machines having straight, but shifted against each other, rotor bars. The obtained results on both 2D and 3D graphs are presented to the rotational speed of the electric motor. Parameters for each particular harmonics have been found with these graphs. These graphs help to identify the origins of these harmonics as the co-action of the MMF of the stator current and the magnetic induction from the rotor in the airgap. Particular attention has been payed to how iron saturation influences these harmonics. The harmonics under study (in quantity of 18) has been taken under consideration, because they exhibited their presence in the above mentioned graphs as the functions of speed. Their origin has been also indicated on the graphs made as an extension of the Kluszczynski analytic/graphic diagrams.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129467589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880382
A. Kavcic
Computers have been used in education from the beginning. Educational systems have developed first from computer assisted learning systems to more complex intelligent tutoring systems and hypermedia systems. Intelligent tutoring systems are knowledge centred and are able to adapt the instructional sequence to the particular user. On the other hand, hypermedia systems are based on hypermedia and the user can freely browse the learning material. The last two technologies have merged into so called adaptive hypermedia systems. They are actually hypermedia systems, which incorporate some intelligent tutoring techniques. Therefore, they offer the freedom of exploratory learning, yet dynamically adapt to the individual user's knowledge level and learning goals, provide intelligent guidance, and support the user in acquiring knowledge. In intelligent tutoring systems, the adaptation is based on user modelling. Since adaptive hypermedia systems take the adaptation principles from intelligent tutoring systems, they also use user models for adapting the system to a particular user. Hence, the user model is one of the most important components for adaptation. Although the adaptation itself can be realised through different techniques, it is always based on the user model. In the paper, adaptive hypermedia systems and their general structure are described first. Then the role of a user model is presented together with the various approaches to user modelling in adaptive hypermedia systems. Finally, we investigate user modelling in different educational adaptive hypermedia systems.
{"title":"The role of user models in adaptive hypermedia systems","authors":"A. Kavcic","doi":"10.1109/MELCON.2000.880382","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880382","url":null,"abstract":"Computers have been used in education from the beginning. Educational systems have developed first from computer assisted learning systems to more complex intelligent tutoring systems and hypermedia systems. Intelligent tutoring systems are knowledge centred and are able to adapt the instructional sequence to the particular user. On the other hand, hypermedia systems are based on hypermedia and the user can freely browse the learning material. The last two technologies have merged into so called adaptive hypermedia systems. They are actually hypermedia systems, which incorporate some intelligent tutoring techniques. Therefore, they offer the freedom of exploratory learning, yet dynamically adapt to the individual user's knowledge level and learning goals, provide intelligent guidance, and support the user in acquiring knowledge. In intelligent tutoring systems, the adaptation is based on user modelling. Since adaptive hypermedia systems take the adaptation principles from intelligent tutoring systems, they also use user models for adapting the system to a particular user. Hence, the user model is one of the most important components for adaptation. Although the adaptation itself can be realised through different techniques, it is always based on the user model. In the paper, adaptive hypermedia systems and their general structure are described first. Then the role of a user model is presented together with the various approaches to user modelling in adaptive hypermedia systems. Finally, we investigate user modelling in different educational adaptive hypermedia systems.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128044979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880032
M. Dodridge, I. Paterson‐Stephens
Countries surrounding the Mediterranean sea enjoy a climate which enables them to obtain significant revenue from their entertainment/leisure enterprises. Commerce and industry involved in such enterprises are increasingly making use of the advances in electrical, electronic and computer engineering and the requirements for engineering education must reflect emerging technologies. Engineering education has seen an explosion in the so called media technology, this often being at the expense of engineering principles. This paper considers the need to develop programmes of study which retain engineering principles and provides an applications bias towards emerging technologies. The skills obtained from this type of programme provide opportunities world-wide and the potential creative, as well as problem solving aspects, provides a high degree of job satisfaction. For example, a degree in Music Technology and Audio System Design offers advanced signal processing techniques which are taught alongside subjects such as studio engineering and acoustics. The delivery of such engineering principles is enhanced by the context in which they are explored. Subjects such as Digital Signal Processing can be brought to life in the context of audio applications, providing a useful vehicle for students to learn an advanced engineering topic and to acquire marketable skills. This is in stark contrast to a traditional approach provided by many engineering degree programmes, where a highly analytical and abstract treatment of signal processing principles is given, doing little to fire the imagination and enthusiasm of students.
{"title":"Educating engineers for Europe","authors":"M. Dodridge, I. Paterson‐Stephens","doi":"10.1109/MELCON.2000.880032","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880032","url":null,"abstract":"Countries surrounding the Mediterranean sea enjoy a climate which enables them to obtain significant revenue from their entertainment/leisure enterprises. Commerce and industry involved in such enterprises are increasingly making use of the advances in electrical, electronic and computer engineering and the requirements for engineering education must reflect emerging technologies. Engineering education has seen an explosion in the so called media technology, this often being at the expense of engineering principles. This paper considers the need to develop programmes of study which retain engineering principles and provides an applications bias towards emerging technologies. The skills obtained from this type of programme provide opportunities world-wide and the potential creative, as well as problem solving aspects, provides a high degree of job satisfaction. For example, a degree in Music Technology and Audio System Design offers advanced signal processing techniques which are taught alongside subjects such as studio engineering and acoustics. The delivery of such engineering principles is enhanced by the context in which they are explored. Subjects such as Digital Signal Processing can be brought to life in the context of audio applications, providing a useful vehicle for students to learn an advanced engineering topic and to acquire marketable skills. This is in stark contrast to a traditional approach provided by many engineering degree programmes, where a highly analytical and abstract treatment of signal processing principles is given, doing little to fire the imagination and enthusiasm of students.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"213 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128245906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.879723
R. A. Guinee
Normal and inverse repeat pseudorandom binary sequences (PRBS) are very effective as persistent excitation stimuli in dynamic testing and parameter extraction in motor drive systems. In general a simple linear time invariant (LTI) second order transfer function model can he deployed in conjunction with PRBS correlation methods for adjustable speed drive (ASD) parameter identification. Very accurate parameter extraction from correlation based impulse response evaluation is achieved using data training records from pseudonoise (pN) testing, in both the online and off-line mode of operation of a PWM controlled variable speed DC motor drive system. The alternative approach of motor parameter extraction from spectral analysis, based on sinusoidal test signals, is used for comparison purposes as a secondary check on the effectiveness and accuracy of the PBBS method and to validate the LTI model used.
{"title":"Variable speed motor drive testing and parameter identification using pseudorandom binary sequences","authors":"R. A. Guinee","doi":"10.1109/MELCON.2000.879723","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879723","url":null,"abstract":"Normal and inverse repeat pseudorandom binary sequences (PRBS) are very effective as persistent excitation stimuli in dynamic testing and parameter extraction in motor drive systems. In general a simple linear time invariant (LTI) second order transfer function model can he deployed in conjunction with PRBS correlation methods for adjustable speed drive (ASD) parameter identification. Very accurate parameter extraction from correlation based impulse response evaluation is achieved using data training records from pseudonoise (pN) testing, in both the online and off-line mode of operation of a PWM controlled variable speed DC motor drive system. The alternative approach of motor parameter extraction from spectral analysis, based on sinusoidal test signals, is used for comparison purposes as a secondary check on the effectiveness and accuracy of the PBBS method and to validate the LTI model used.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127674459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880390
J. Neves
The convergence of telecommunications and computer communication technologies requires the development of interworking units to convert different data formats, protocols and control procedures. This paper describes the architecture of an electronic device, which is able to perform interworking functionalities between ATM, ISDN and Ethernet networks and presents several scenarios for interconnection environments.
{"title":"ATM interworking unit with ISDN and Ethernet interfaces","authors":"J. Neves","doi":"10.1109/MELCON.2000.880390","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880390","url":null,"abstract":"The convergence of telecommunications and computer communication technologies requires the development of interworking units to convert different data formats, protocols and control procedures. This paper describes the architecture of an electronic device, which is able to perform interworking functionalities between ATM, ISDN and Ethernet networks and presents several scenarios for interconnection environments.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116399650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880050
R. Sernec, M. Zajc, J. Tasic
This paper presents a path of parallelism exploitation in commercial programmable DSP processors. DSP processors have gained in their complexity and have adopted some very sophisticated parallelism extraction techniques, namely very long instruction word (VLIW) and SIMD designs. The intention is to show a development path of digital signal processors (DSP) and focuses on their features that allow parallel processing of algorithms.
{"title":"The evolution of DSP architectures: towards parallelism exploitation","authors":"R. Sernec, M. Zajc, J. Tasic","doi":"10.1109/MELCON.2000.880050","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880050","url":null,"abstract":"This paper presents a path of parallelism exploitation in commercial programmable DSP processors. DSP processors have gained in their complexity and have adopted some very sophisticated parallelism extraction techniques, namely very long instruction word (VLIW) and SIMD designs. The intention is to show a development path of digital signal processors (DSP) and focuses on their features that allow parallel processing of algorithms.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127051994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.879970
A. Posavec
The expressive power and the epistemic adequacy of the Dempster-Shafer (DS) theory of evidence has often been acknowledged. DS theory of evidence is based on two components: a tool for representing belief for a statement, i.e. a pair of set functions (Bel, Pl) that quantify to what extent available evidence implies the statement and to what extent is available evidence consistent with the statement, respectively; and a tool for combining evidence. Thus DS theory deals with belief intervals rather than single numerical values of belief. There is an explicit differentiation between the notion of disbelief from that of lack of belief. However, as many other methodologies in the field of uncertain reasoning, DS theory addresses only the problem of representing the uncertainty of knowledge, without dealing with the problem of representing the knowledge itself. Saffiotti (1994) has proposed a framework for integrating the DS theory with a knowledge representation system. This approach introduces so-called belief bases, whose purpose is to allow embedding belief functions into a knowledge representation system which is better suited for representing the knowledge itself. Belief bases for a given knowledge representation system are built using three primitive operations, which utilize Dempster's combination rule. This paper describes an attempt at integrating appropriately modified belief bases into a knowledge representation system which utilizes Petri nets for representing knowledge.
{"title":"Integrating Dempster-Shafer belief functions into a knowledge representation system based on Petri nets","authors":"A. Posavec","doi":"10.1109/MELCON.2000.879970","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879970","url":null,"abstract":"The expressive power and the epistemic adequacy of the Dempster-Shafer (DS) theory of evidence has often been acknowledged. DS theory of evidence is based on two components: a tool for representing belief for a statement, i.e. a pair of set functions (Bel, Pl) that quantify to what extent available evidence implies the statement and to what extent is available evidence consistent with the statement, respectively; and a tool for combining evidence. Thus DS theory deals with belief intervals rather than single numerical values of belief. There is an explicit differentiation between the notion of disbelief from that of lack of belief. However, as many other methodologies in the field of uncertain reasoning, DS theory addresses only the problem of representing the uncertainty of knowledge, without dealing with the problem of representing the knowledge itself. Saffiotti (1994) has proposed a framework for integrating the DS theory with a knowledge representation system. This approach introduces so-called belief bases, whose purpose is to allow embedding belief functions into a knowledge representation system which is better suited for representing the knowledge itself. Belief bases for a given knowledge representation system are built using three primitive operations, which utilize Dempster's combination rule. This paper describes an attempt at integrating appropriately modified belief bases into a knowledge representation system which utilizes Petri nets for representing knowledge.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"194 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124318490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880025
S. Mylonas, P. Trancoso, M. Trimikliniotis
A method for the processing of digital images using a two-dimensional LMS adaptive filter for noise reduction and subsequent edge detection is presented. This is implemented on a parallel virtual machine (PVM) consisting of inexpensive PCs (network of workstations, NOW). The experimental results for different image sizes and system configurations show close to linear speedup. Experiments to test dynamic load balancing are also performed.
{"title":"Adaptive noise canceling and edge detection in images using PVM on a NOW","authors":"S. Mylonas, P. Trancoso, M. Trimikliniotis","doi":"10.1109/MELCON.2000.880025","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880025","url":null,"abstract":"A method for the processing of digital images using a two-dimensional LMS adaptive filter for noise reduction and subsequent edge detection is presented. This is implemented on a parallel virtual machine (PVM) consisting of inexpensive PCs (network of workstations, NOW). The experimental results for different image sizes and system configurations show close to linear speedup. Experiments to test dynamic load balancing are also performed.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132674019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.879995
G. Moschovitis, K. Karpouzis, S. Kollias
We propose a design architecture for the graphics engine of a virtual reality system to be deployed over the Web. The graphics engine is decomposed into high and low level components. The high level component manages the hierarchical organization of the virtual objects, while the low level component acts as the interface to the graphics hardware and is mainly responsible for operations, such as vertex transforms and polygon rasterization. Several methods for geometry representation, compression and culling are compared and associated with different geometry types. The use of OpenGL as a general-purpose machine to implement mathematical operations is considered in the context of programmable shaders. Finally a prototype application for virtual worlds modeling is presented along with detailed discussion on technical and implementation issues.
{"title":"Virtual worlds modeling for Web deployment","authors":"G. Moschovitis, K. Karpouzis, S. Kollias","doi":"10.1109/MELCON.2000.879995","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879995","url":null,"abstract":"We propose a design architecture for the graphics engine of a virtual reality system to be deployed over the Web. The graphics engine is decomposed into high and low level components. The high level component manages the hierarchical organization of the virtual objects, while the low level component acts as the interface to the graphics hardware and is mainly responsible for operations, such as vertex transforms and polygon rasterization. Several methods for geometry representation, compression and culling are compared and associated with different geometry types. The use of OpenGL as a general-purpose machine to implement mathematical operations is considered in the context of programmable shaders. Finally a prototype application for virtual worlds modeling is presented along with detailed discussion on technical and implementation issues.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133640060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)
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